[Mail] sendmail不能外发邮件

[weixin_38058748]

rh9，自带得sendmail-8.12.8-4
我是按照前辈的帖子配置的，http://chinaunix.net/jh/14/323327.html
现象是可以发内部的邮件地址，但是外发就不行，收外部邮件还没测试。
错误：
The message could not be sent because one of the recipients was rejected by the server. The rejected e-mail address was '[e-mail]'. Subject 'test', Account: 'www.etcorp.com.cn', Server: 'www.etcorp.com.cn', Protocol: SMTP, Server Response: '550 5.7.1 <[e-mail]>;... Relaying denied. IP name lookup failed [219.238.229.13]', Port: 25, Secure(SSL): No, Server Error: 550, Error Number: 0x800CCC79

请教改如何配置啊？
谢谢！